High-entropy Doping Modification of High-nickel Single-crystal Layered Ternary Cathode Material

doi:10.15541/jim20250085

Abstract

Abstract: LiNi_xCo_yMn_1-_x_-_yO₂ (NCM, x≥0.8), a promising cathode material for lithium-ion batteries, possesses high energy density and excellent discharge performance. However, it also faces challenges such as severe cation disorder, poor cycling performance and safety at high temperatures and high cut-off voltages. In this study, a high-entropy (HE) doping modification strategy was introduced into the high-nickel and low-cobalt LiNi_0.86Co_0.04Mn_0.1O₂ cathode material, and a high-nickel single-crystal layered ternary cathode material was synthesized by a high-temperature solid-state reaction method. The results show that at 0.5C (1C=180 mA·g^-1)and 25 ℃, the battery equipped with modified material has a reversible discharge capacity of 197 mAh·g^-1 and exhibits excellent discharge performance at high temperatures and high cut-off voltages. At 0.5C, 4.30 V and 55 ℃, the discharge capacity reaches 281 mAh·g^-1, and at 0.5C, 25 ℃ and 4.50 V, the discharge capacity is as high as 194 mAh·g^-1. This material has a good layered structure with a uniform arrangement of nanoscale primary particles at the microscale and a smaller total impedance. This work significantly improves the cycling performance and safety of high-nickel ternary cathode materials at high temperatures and high cut-off voltages, providing a good modification method for the cobalt-free, high-nickel and practical application of ternary materials.

Key words: high-entropy, single crystal, high nickel and low cobalt, ternary cathode material

CLC Number:

O646

HOU Jiabing, HU Qiang, CUI Jiuzhi, HUANG Yundi, WANG Xinrui, LIU Xingquan. High-entropy Doping Modification of High-nickel Single-crystal Layered Ternary Cathode Material[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20250085.

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